[ Grammar ]
I ______ the door before I realized that the keys were inside the house.
A. lock
B. locked
C. has locked
D. had locked
Select your answer:
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I vs. MeGerund vs. InfinitivePrincipal vs. Principle Modal Verbs of Certainty and PossibilityRelative PronounsSimple PastSimple Present Continuous TensePresent Progressive or Present SimpleSimple Past - Irregular Verbs
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